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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea0ec0e6794e6e65a5a3817f551a4fe2838d8429aea737231f7dd2e08535c40' 
  AND token = 'OyQssN6R29R921dkc20Zc7wOhDZE+xp7Id5Up37wVyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}